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參數資料
| 型號： | AG2410 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | HIGH PERFORMANCE QUAD TRUNK |
| 中文描述： | 高性能四干線 |
| 文件頁數： | 4/11頁 |
| 文件大小： | 280K |
| 代理商： | AG2410 |
V1.4 February 2005
Data Sheet
Ag2410
HIGH PERFORMANCE QUAD TRUNK
2.0
Line Interfacing
The line interfaces on the Ag2410 provide a flexible
and robust interface to the telephone line. They are
designed to meet regulatory standards whilst providing
a space and power efficient solution.
2.1
D.C. Termination.
Any equipment terminating a telephone line must
present the correct d.c. resistance to the line. This
ensures that the correct current flows to be able to
detect the off hook condition, avoids excessive power
dissipation in the Subscriber Line Interface (SLIC) and
the Subscriber’s equipment and minimises the size of
power supply needed to drive the SLIC.
The Ag2410 has been designed to meet the
requirements of many network operators. This is done
by making the d.c. characteristic adjustable. These are
controlled by connecting the DM pins on the line side of
the circuit. Table 1 shows how these are connected.
Table 1 Set Up of the DM Pins
Market
DMa
DMb
North America
(EIA 464, Resistive)
Connect together
through 270K resistor
Europe (CTR21)
Connect together
through 470K resistor
Far East
Connect together
through 270K resistor
2.2
Signalling and Loop Status.
The Ag2410 provides facilities to monitor and control
the telephone line. This allows the device to be used
with a variety of loop signalling schemes and minimises
the number of external components needed to
implement a complete line interface.
2.2.1 The On-Board Loop Switch
The Ag2410 implements the loop start protocol when
initiating and answering a call. This means that a
switch must be closed to allow loop current to flow,
signalling to the SLIC that the terminating equipment
has gone “off-hook”. This has been done historically
by a relay. The Ag2410 uses an integral optically
isolated switch to do this, eliminating the need for an
external relay, so space and cost is saved for the user.
The On-Board Loop Switch is controlled by the LSC
pin. A logic 1 applied to the pin closes the loop switch.
This is done when the terminating equipment wishes to
begin a call or in response to the reception of the
ringing signal. The LSC pin can be controlled by the
output drive pins of a Codec or from a micro controller
device.
Once the Loop Switch has been closed confirmation
that loop current is flowing is provided by the LC pin.
This can be used for fault detection and for call clear
detection.
2.2.2 Ringing Detection and Sensitivity.
The terminal equipment must be capable of detecting
and responding to an incoming call in the same way as
a telephone set. The termination circuitry must,
therefore, detect the presence of the ringing signal.
The Ag2410 provides an output, RS, which indicates
the presence of ringing by switching from a logic 1 to
logic 0. The RS output will toggle at twice the ringing
frequency. A capacitor to ground can also be added if
ringing cadence is needed rather than the ringing
frequency.
The sensitivity to ringing is set internally to 20Vrms.
2.2.3 Reversal Detect
The ringing detect circuit will also detect DC polarity
reversal at Tip/Ring. Since this is AC coupled only a
pulse output (15mS min.) is given at the RS output at
the instant of reversal.
An example of this type of signalling is in Caller Line ID
in the United Kingdom, where a battery polarity
reversal precedes the transmission of data before the
ringing signal is applied to the line.
There must be greater than 30V across Tip and Ring
for reversal detect to function correctly. This means
that there is no detection when off-hook.
3.0 The 2-4 Wire (Hybrid) Conversion.
Each circuit on the Ag2410 module transmits and
receives balanced 2-wire analog signals at the Tip and
Ring connections. These are converted to a ground
referenced output at V
OUT
and from a ground
referenced signal at V
IN
.
V
OUT
and V
IN
are normally connected to a Codec (via
d.c. blocking capacitors) for conversion to and from a
Pulse Code Modulated (PCM) stream.
3.1 Transmit and Receive Gain.
The gain in both the transmit and receive directions is
set at 0dB. Any gain adjustments can be made using
the Codec functionality. This is either by hardware or
software depending upon the Codec used.
Silver Telecom 2005
Page 4
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